A patient is prescribed metoclopramide for the treatment of gastroparesis. Which of the following is a primary effect of metoclopramide?
Reduces gastric acid secretion
Enhances gastrointestinal motility
Relieves abdominal pain
Acts as an antiemetic by inhibiting serotonin
The Correct Answer is B
A. While metoclopramide may have some effect on gastric acid secretion, its primary role is not to reduce it.
B. Metoclopramide primarily enhances gastrointestinal motility, which helps to facilitate gastric emptying and is especially useful in treating conditions like gastroparesis.
C. Metoclopramide does not specifically relieve abdominal pain; it focuses more on motility and nausea.
D. Although metoclopramide does have antiemetic properties, it primarily acts as a dopamine receptor antagonist rather than directly inhibiting serotonin.
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Correct Answer is D
Explanation
A. While historical context is useful, the development of antimicrobials primarily began in the early 20th century, notably with penicillin discovered by Alexander Fleming in 1928.
B. This statement is incorrect; fluoroquinolones primarily inhibit bacterial DNA synthesis rather than directly affecting the cell wall.
C. Selective toxicity is a principle of antimicrobial action but does not directly explain how a specific antimicrobial works therapeutically.
D. Penicillin specifically interferes with the synthesis of the bacterial cell wall, leading to cell lysis and death of the bacteria, which is a fundamental mechanism of action for this antibiotic.
Correct Answer is C
Explanation
A. Chest pain and pale skin are not typical adverse effects associated with diltiazem use.
B. Shortness of breath and wheezing may occur due to other conditions or medications but are not common adverse effects of diltiazem.
C. Calcium channel blockers like diltiazem can cause peripheral edema due to vasodilation and bradycardia as a result of their action on the heart rate. Monitoring for these effects is essential in patients taking diltiazem.
D. Tachycardia is not an expected adverse effect of diltiazem; in fact, it is used to manage conditions where tachycardia may be present. Anxiety is also not a direct adverse effect of this medication.